Pixie went through a biting stage about 10-12 weeks and what I did was when she would bite I would say OUCH and stand up and walk away for about 3 min and not play with her or I would turn my back on her and ignore her.
He will outgrow it and he is young but don't allow him to do it bc then he will think biting is ok. you can also give him some chewing toys bc he is teething and that might help the situation. You could try a bully stick they just love these but I would always watch him when he has a bully stick. Never leave him unattended with anything like that bc they can choke.
Free Range Dog Chews Bully Sticks 12" Select - Olive: Green Goods for Modern Dogs
This is where I order my bully stick bc they are free range